Through thousands of years it has been well known in the Far East, that the essential oils, especially from menthol, peppermint and eucalyptus prevent itching from insect bites. In particular, the cooling effect in the menthol oil contributes to this effect.
If you’ve got an insect bite, you can screw the little bottle of, at the bottom of its Poy-Sian Mark II, menthol inhaler. The oil in the bottle is then applied to the area around the insect bite, which will then help you to alleviate the itching. Refer to the image.